ABSTRACT
Wireless sensor networks routing protocols are usually oblivious to the existence of unidirectional links and can be very difficult to manage when multiple nodes are needed as in the case of large networks such as smart city, smart farming, and smart health. We proposed to use Software Defined Network routing algorithm to correct this, instead of using the flooding-based or specific purpose protocols found in the literature. To achieve this goal, it would be necessary to devise a Topology Discovery and Neighbour Discovery protocols tailored for unidirectional networks. This work therefore developed a Hybridised Software Defined Routing Model for Wireless Sensor Networks and implemented the model using SDN-WISE. The Hybridized model was compared with Topology Discovery and Neighbour Discovery Routing in homogeneous and heterogeneous networks. The results showed that SDN is a promising alternative for routing in unidirectional networks and it is more energy efficient and transmit packets at a steady rate.
CHAPTER ONE
1.0 INTRODUCTION
1.1 Background of the Study
With more devices becoming smart and in need to be always connected, providing pervasive wireless networking becomes essential (Akyildiz, et al., 2002). Wireless Sensor Network devices need to be able to communicate effectively without losing connection, which makes a good network protocol solution important. This is especially important in Wireless Sensor Networks (WSNs) with limited resources. Solutions for wireless networks is growing, but because of the complexity of these solutions, it is not possible to apply the same technique developed in Cellular and Wi-Fi networks. The rise in the number of smart devices makes it possible to create new applications for monitoring and control of different phenomenon that will help us in our daily lives. Applications that make it easier for health monitoring, industrial automation and smart cities. But when it comes to implementing more devices into the network, a more efficient way for network management and routing is required. Ad hoc and wireless sensor networks routing protocols are usually oblivious to the existence of unidirectional links. We propose to use Software Defined Network to take advantage of these links, instead of using the flooding-based or specific purpose protocols found in the literature.
To achieve this goal, it is necessary to device Topology Discovery and Neighbour Discovery protocols tailored for unidirectional networks The SDN architecture provides a control layer, which is logically centralized, and maintains a global view of the network. The controller provides flexible configuration and network management, it also optimizes the number of network resources via automated and dynamic software programs. SDN and
OpenFlow (the most common standard used by the SDN architecture) have been tested successfully both for wired networks and Wireless Mesh Networks
(WMNs), but have not been fully utilized yet in WSNs. Some efforts have been done to create an efficient routing and communication protocol concepts for access control to WSNs, however, they have not addressed efficiently the problem currently plaguing the current protocols. Software defined network as shown a great possibility of solving this problem with its concept of decoupling.
1.2 Statement of Problems
The existing routing protocol for wireless sensor networks faces the problem below:
Wireless sensors do not have a global central control and have to be self-organized. This is unlike computer networks with IP address and central device for controlling.
There is no Self Organized Route Discovery required to handle topology changes.
Wireless sensor network has a Distributed computing/communication to achieve a single task rather than point-to-point communication. It is centred on event reliability concept rather than data reliability.
1.3 Motivation for The Study
Generally, in networking, network administrator faces a lot of challenges in managing networks due to the tight coupling of the control and data layer in network device. Having a large network may prove vary tedious to manage if the traditional network model is used. to introduce new features in the network one has to physically locate the devices and might need to restructure the whole network. The project topic was motivated by the following questions:
What if we have an intelligent network that is centrally managed and has a general overview of the whole network?
What if introducing new features in a network is as easy as installing a software on a computer system?
What if a network is able to determine on its own best routing path to follow?
What if a network is able to continue functioning even if some nodes gets damaged by easily discovering the network topology?
1.4 Aim and Objectives
The aim of this project work is to develop a hybridised software defined network routing algorithm for wireless sensor networks.
The objectives are to:
Develop a Framework for Hybridising Neighbour Discovery and Topology Discovery Algorithms of Software Defined Networks.
Implement a Model for Hybridised Software Defined Network Routing Algorithm.
Simulate a Wireless Sensor Network Communication using the Hybridised Software Defined Network Routing Model.
Evaluate the Security and Fault Tolerance Performances of the Wireless Sensor Communication.
1.5 Significance of the Study
By implementing SDN in the network, it will make the network management less complex and provides better flexibility in scalability and mobility support. This is mainly due to the separation of data plane from the control plane and the simplification on the implementation of new applications in the network. Other benefit achieved by SDN implementation is related to the capability of SDN in providing resource management. With SDN implementation, different applications are able to share same network infrastructure. The access of each application to the forwarding elements is managed by the control unit. In fact, this is feasible because the controller has the global view information of the network and it knows the requirements of the application. So the SDN makes applications have precedence over the conventional routing policies. This will
make the policy decisions more consistent and effective in the network. It also gives a more flexible way to implement new functionalities in the network. These benefits in summarization will make it simpler to modify the policies in the network. It will keep high-level policies intact by using a control program which react to changes of the network state. Finally, because of the centralized controller having knowledge of the network state, the development of networking applications, functions and services will be simplified.
1.6 Scope of the Study
This study focuses on the implementation of routing model of software defined network (SDN) in wireless sensor network (WSN) putting into consideration the following algorithms
Topology Discovery Algorithm: an algorithm developed for the SDN controller to discover the nodes present and the corresponding topology of the network.
Neighbour Discovery Algorithm: an algorithm developed for the nodes to discover its neighbour node.
For full project please contact
Abubakar.faith.af@gmail.com.
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